Definition of stratum

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Stratum (n.) A bed of earth or rock of one kind, formed by natural causes, and consisting usually of a series of layers, which form a rock as it lies between beds of other kinds. Also used figuratively..

Lern More About Stratum

Strike :: Strike (n.) The horizontal direction of the outcropping edges of tilted rocks; or, the direction of a horizontal line supposed to be drawn on the surface of a tilted stratum. It is at right angles to the dip..
Outlier :: Outlier (n.) A part of a rock or stratum lying without, or beyond, the main body, from which it has been separated by denudation..
Substratum :: Substratum (n.) That which is laid or spread under; that which underlies something, as a layer of earth lying under another; specifically (Agric.), the subsoil..
Seam :: Seam (n.) A thin layer or stratum; a narrow vein between two thicker strata; as, a seam of coal..
Stratagem :: Strata (n.) pl. of Stratum.
Drill :: Drill (v. t.) To cause to flow in drills or rills or by trickling; to drain by trickling; as, waters drilled through a sandy stratum..
Mine :: Mine (v. t.) To dig away, or otherwise remove, the substratum or foundation of; to lay a mine under; to sap; to undermine; hence, to ruin or destroy by slow degrees or secret means..
Understratums :: Understratums (pl. ) of Understratu.
Ledge :: Ledge (n.) A layer or stratum.
Fahlband :: Fahlband (n.) A stratum in crystalline rock, containing metallic sulphides..
Rampart :: Rampart (n.) A broad embankment of earth round a place, upon which the parapet is raised. It forms the substratum of every permanent fortification..
Bed :: Bed (n.) A layer or seam, or a horizontal stratum between layers; as, a bed of coal, iron, etc..
Subject :: Subject (a.) That in which any quality, attribute, or relation, whether spiritual or material, inheres, or to which any of these appertain; substance; substratum..
Rubble :: Rubble (n.) A mass or stratum of fragments or rock lying under the alluvium, and derived from the neighboring rock..
Base-burner :: Base-burner (n.) A furnace or stove in which the fuel is contained in a hopper or chamber, and is fed to the fire as the lower stratum is consumed..
Turf :: Turf (n.) That upper stratum of earth and vegetable mold which is filled with the roots of grass and other small plants, so as to adhere and form a kind of mat; sward; sod..
Underlie :: Underlie (v. t.) To lie under; to rest beneath; to be situated under; as, a stratum of clay underlies the surface gravel..
Shelf :: Shelf (v. i.) A stratum lying in a very even manner; a flat, projecting layer of rock..
Girdle :: Girdle (n.) A thin bed or stratum of stone.
Sod :: Sod (n.) That stratum of the surface of the soil which is filled with the roots of grass, or any portion of that surface; turf; sward..
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